Oh boy this is a BIG topic!! I think most of would admit that we have waaaaay more stuff than we have room for - lol!! I am constantly having to shuffle, move stuff (which then I don't remember where to) and rearrange!
My favorite organization tip . . . mmmmm, I think whatever makes you happy is best! What I mean is, you can always find things around the house or stores to organize with but I find that I'm happiest when I find little vintage containers to repurpose because I love stuff like that! Making my space reflect ME makes me happiest.
For example, my Copic markers are all housed in 2 (I need to find a 3rd now - eek!) fabulous wooden boxes - they are square, I think one used to be part of a canister set, and work perfectly layed down on their sides with the marker tops pointing out toward my workspace.
I also have a great little white wire picnic organizer (picked up at a thrift store), that has lots of "compartments". My stamps are mostly housed, by company, in different baskets and vintage boxes.
I have pretty little colored Glassbake mugs that I use to store bling, pearls and small acrylic blocks and a few vintage wooden office trays to store other items. You can find lots of things like this at thrift stores, antique stores and one of my favs- Goodwill! All my Divine Twine is on wooden dowels which have been hotglued into the base of little glass/crystal candlestick holders - each about $1 at Goodwill! With all of them being different styles and heights, it makes it so pretty!
Seeing all my pretties housed in pretties makes me happy! Use what works for you but use things made in a style you love!!